Calculate the refractive index of the material of the glass block shown in the diagram if YZ = 4cm

• A. 0.40
• B. 0.60
• C. 1.50
• D. 1.67

The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?

• A. the pressue is reduced
• B. the sound waves are pumped out
• C. the waves are absorbed in the inner walls
• D. There is no more material medium

An image which can be formed on a screen is said to be

• A. virtual
• B. blurred
• C. inverted
• D. real

Which of the following remains unchanged as light travels from one medium to the other? i. speed. ii. wavelength. iii. frequency.

• A. i only
• B. ii only
• C. iii only
• D. i and ii only

A body moves with a constant speed but has an acceleration. this process if it

• A. moves in a straight line
• B. moves in a circle
• C. is oscillating
• D. is in equilibrum

Which of the following are true of plane-polarised right? i. Plane polarisation of light is the formation of hydrogen bubbles on the particle of light. ii. Plane components. iii. A plane polarised light vibrates in one plane. iv. Polarisation of light is characteristic of transverse vibration

• A. i and ii only
• B. i and iv only
• C. ii and iii only
• D. i and ii only

(a) Distinguish between temperature and heat. State the units in which they are measured

(ii) State two physical properties used for measuring temperature.

(b) (i) Describe, with the aid of a diagram, how the upper fixed point is determined for a mecury-in-glass thermometer. State one precaution to ensure accurate results

(ii) State one advantage which a constant-volume gas thermometer has over other thermometers and one reason why it is seldom used as an everyday laboratory instrument.

(c) Using the kinetic theory of matter explain why evaporation causes cooling.

what part of the camera corresponds to the iris of the eye?

• A. shutter
• B. film
• C. lens
• D. diaphram

Two forces, whose resultant is 100N are perpendicular to each other. If one of them makes an angle of 60o with the resultant, calculate the magnitude. (Sin 60o = 0.8660, Cos 60o = 0.500)

• A. 200.0N
• B. 173.2N
• C. 115.5N
• D. 50.0N

Which of the following is stored by dry Leclanche cell?

• A. chemical energy
• B. nuclear energy
• C. solar energy
• D. heat energy